Word: ultraviolet
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...less appealing than it already is. The International Agency for Research on Cancer has named the so-called graveyard shift--worked in part by nearly 20% of the laboring population in Europe and North America--as a probable carcinogen, joining other likely cancer causes such as anabolic steroids and ultraviolet radiation...
...with their unexpected brightness and intensity. Through the use of “raking light”—lighting a surface from the side and illuminating various sketches on the sculpture and the weathering pattern of the stone—as well as using photography under ultraviolet light, archaeologists were able to trace the remaining pigment residues on the sculptures, and so recreate the appropriate colors that adorned these pieces of art. The exhibit is separated into three time periods: Greek sculptures from the archaic and classical period (c. 600 B.C.E — c. 330 B.C.E), sculptures...
...picture sharper than the Hubble could, but it took a lot longer. The instrument is also limited to a patch of sky only about 1?120th the width of the full moon; the Hubble's field of view is 150 times as large. And the Hubble can see ultraviolet and infrared light, which the atmosphere blocks. Ultimately, says Mackay, "we're not competing with the Hubble. We're simply trying to provide an alternate for when the Hubble dies...
...them to collapse into far smaller objects than they could before. The second generation of stars, incorporating the ashes of the first, arose almost immediately. They were much more like the sun, in both composition and size. And like the sun, they would have started out generating lots of ultraviolet light before settling down to a more sedate existence...
...this radiation--the ultraviolet light from hot, newly formed stars--that many theorists suspect finally reionized the remaining hydrogen, making it transparent again and bringing the Dark Ages to a close. Others suggest that the process may have been powered instead by black holes spewing out X-rays and ultraviolet light. Or it may have been a combination of hot stars and black holes that cleared the hydrogen and put an end to the Dark Ages...